Testing system



Nov. 11, 1930. B. G. DUNHAM TESTING SYSTEM Filed June 30, 1928 6 Sheets-Sheet l Nov. 11, 1930.

B.G.DUNHAM TESTING SYSTEM Filed June 50, 1928 6 Sheets-Sheet 2 //v VENTOR. BERT 6f UUNHAM A rrm/vfr TESTING SYSTEM Filed June 30, 1928 6 Sheets-Sheet 3 Gmg ATTORNEY Nov. 11, 1930. I DUNHAM 1,780,910

TESTING SYSTEM Filed June 50, 1928 6 Sheets-Sheet 4 B 7' 6T DUNHAM m A 7' TORNE Nov. 11, 1930. B, G, DUNHAM 1,780,910

TESTING SYSTEM Filed June 30, 1928 6 Sheets-Sheet 5 IIHI- Nov. 11, 1930. DUNHAM 1,780,910

TESTING SYSTEM Filed June 30, 1928 6 Sheets-Shet 6 J" IHI /WENTUR.

5y 55m 6? DUNHAM ATIORNEY Patented Nov. 11, 1930 UNITED STATES BER-T G. DUNHAM, OF HAWTHORNE, NEW JERSEY, ASSIGNOR TO BELL-TELEPHONE" LABORATORIES, INCORTE()RJA'IIEI); OF NEW YORK, N. Y., A CORPORATION OF NEW YORK Application filed June The present invention relates to a testing system in a machine switching telephone oilice. More specifically, it relates to a system for testing the responsive action of sender registers to signals transmitted thereto by electrically operable register setting apparatus.

The object of this inventionis to provide devices for simplifying automatically operable circuit arrangements for testing impulse producing senders.

One embodiment of the present invention comprises an automatically operable register setting device for variably positioning sender registers for the transmission of impulses. This register setting device comprises a group of selectable relays which may be individually operated for establishing electrical connections with any registers associated therewith. An automatically progressive switch is rotated as the registers are operated for consecutively operating a plurality of these relays. V The registers of a sender may thus be set in any desired manner for transmitting impulses to represent any desired.

combination of digits.

Another embodiment of the present invention comprises signaling devices having switches operable in accordance with the impulses transmitted by the sender in response to the action of the register setting device. The switches operated by the sender have brushes movable in two directions and terminals strapped in primary and. secondary ordinates. One brush of the switch is associated with the terminals of a primary ordinate and a second brush of the switch is associated with the terminals of a secondary ordinate. Signaling apparatus is associated with the switch terminals for indicating the pos tion taken by the switch brushes, one signal being common to each group of ordinates. g

V This invention has been illustrated in the accompanying drawing in which:

Fi s. 1 and 3 show a group of four registers K, B, O and D which correspond in their operation to the registers of a sender; V

Fig. 5 includes auxiliary relays operated conjunction with the register relays of TESTING SYSTEM 1928. Serial No. 289,390.

Figs. 1 and 3. A diagrammatic embodiment 01 a sender to be tested and a switchnfo'rj selecting senders to be tested are also included in this figure.

Figs. 2 and 4 show two stepby-step switches of a type well known in-the art arranged to advance the brush member Vertically for selectinga terminal level and horizontally for selecting'a terminal of a particular level in response to impulses transmitted thereto.

Fig. 6 shows a group often relays'for controlling the sender and testingcircuit registers and step-by-step switches for selectingv combinat ons of these relays;

Fig. 7 shows the arrangement ofthe drawings forming a part of this specification.

The testing arrangement illustrated herein is arranged for testing the sender disclosed in Patent 1,619,250 issued to me March, 1, 1927. this sender will be given-in this'specification to complete the circuit paths established by the testing circuit. It is believed unneces-v sary to g ve further detailedexplanati'on of the sender since this may be obtained by re ferring to the description'in the patent.

I The ten relays R to R" in combination with switches 600 and 610- and relays 621, 622 and 623 are arranged to duplicate auto matically any combination of sender register control that may be accomplished by the.

operation of the register control keys shown.

in Fig. 3 of the foregoing Patent 1,619,250.,

The contacts of the relays replace the con- Only suiiicient detailed operation of tacts of the keys for establishing circuits ineluding or excluding resistances 634: or 636 for operating the sender registers. Switch 610 is progressively operated to select various combinations of the register control relays R and R and switch 600 is operated to progressively operate the register control relays selected in each position of switch 610. The circuits established through the contacts of the register control relays are not only associated with the sender registe s but are associated with the testing circuit registers shown invFigs. 1 and 3. The testing circuit registers are operated in the, same manner as the sender registers in order to operate the signals in'group's A, B, C andD and to mark terminals in terminal banks-200 and 400. It will be noted in the detailed description of this testing circuitthat certain of the circuits established from the contacts of the "registercontrol frelays to the sender regis ters are, extended through the windings of thetestingfcircuitregister relays. a The windingsof these relays through which the ciraforementioned patent.

cuits :are extendedreplace' the retardation colls' 360 and 361 shown in i As'man of the re ister-control rela s ma be consecutlvely operated as are necessary to test the registers cfa sender. In'th1s d1s-z closure only "four of thei relays are consecutivelyf operated for each test which causes the, sender to transmit impulses TOIYfOUI" digits to the switching apparatus 250 and 450; Oneflamp in each group A, B, G and D is lighted in accordance with the testing circuit register settings. The terminal ordinate with which each brush should be asso-. ciated. in response to the operation ofth e; sender is thus'indicated to an attendant. If

V the impulses are transmitted by the sender in accordance with the register control relays operated, lamps 213, 212, 113and 4112 are lighted to indicate that the test initiated has been satisfactorily completedq A circuit is established through .the contacts of relays 1210, 211, 41 01and 111 for operating relays to advance the testing circuit for the operation 8 of: other .iregist-er controlrelays andconsequently a dilferent operation of the. sender. I Detailed description 8 Key 620 is operated tostart the operation of this testing circuit. .Let itbe assumed that switch 530 isassociated with the first sender to be tested." The operation of key620 associates ground with the winding of relay 114 for operating said relay. The operation of relay 114 connects batteryand ground to the contacts of register relays, Figs. 1 and 2, andto the switching relays, Fig. 5. Only one circuit ishowever completed at this time and 518 to battery, through the winding of- 65 u I c I I Y tothefourth terminal position. This circuit which operates relay 10'. for connecting the relays ofregisterA with the control relays,

Fig. 6. This circuitmay be traced from ground, through the fifth contact of relay 114, upper contacts of relays 521, 520, 519

relay 107;, A circuitis also established by theoperation of key 620 to rotate switch 610 maybe traced from ground through the norbrushes 613 to 616, inclusive, are thus associated with certain of the register control relays R to R The pulsing circuit between the sender and switch 250 is established through the right inner contact of key 620 whichmayhe traced from hatteryfthrough the left Winding of relay220, normal contacts 3 of relay 220, brush 532 and itsassoci-ated contact, normal contacts of relays 825 and'8O9, winding of relay 881, brush 531 and 1ts assoc ated contact, rightinner contact of fikey 620, normal contactof relay 650, fourth normal contact of relay 229 to ground 7 through the right winding of relay 220. 'Be- 1 lays 220 and 881 are operatedin the circuit traced. The operation of-relayl220estah-' lishes an energizing circuit for relay 22'? from battery through 1ts wind ng, contact of relay 220 to ground through the normal contact 5 of relay 229. Relays 220 and 227 re-- main operated awaiting the pulses fromthe sender. 7

Referring tot-he sender, Patent 1,619,250,

Fig. 8 and the description thereof, will be, noted that the operation of'relay 881 establishes an operating circuit for relay 382', that the operation of relay 882 establishes an operating circuit for relay803,that the operation of relay 803 establishes'an operating circuit for relay 807 and that the operation of relay 807, establishes an operating circuit for relay 802. The operationYo-f relaySO'Z connects ground to brush 533 and its associated contact, normal contact 1 of relay 513, normal contact of relay 622, Windingofrelay 623 to battery. The operation of relay 623: associ-.

ates the ground from the contactof relay 807 through the winding of relay 621 to battery and the operation of relay 621 e'stablishesan obvious operating circuit for relay 622. The operation of relay 622 opens the original op eratingcircuitfor relay 623. Itwilibe noted thatrelays 621,622 and 623 are'sloW-releasing relays. During the time that theserelays remain operated certain functions are accomplished. The operation ofrelayj621 establishes acircuit for the operation of a register control relay, which circuitmay' be traced from ground through the'norrnal contact 2' of relay 512, normal cont-act2 of relay' fi13, contact 1 of relay 621, brush-603Iand its associated contact in position 1, brush 616 and its 7 i I associatedjcontact' in position i, winding of relay R tobattery. Relay R controls the operation of register relays, Fig; 1, inthe testing circuit and register relays in the sender, which will be described later. Relay Y 623 releases before relay 622. During the time that relay 622 is operated, a circuit is established to advance switch 600 to the next terminal position. This circuit extends from ground atthe contactof relay 807 to the contact of relay 622 as previously traced, through thenormal contact'2 of relay 623, which is established upon the release of relay 623,

position, and the circuit forrelay R is opened to causeits release. y I 7 During the period of time that relay E is operated, ground is connected through its contact to conductor 640, winding of relay 510, fourth contact of relay 107, lower winding of relay 108, brush 535 and its associated contact, contact oi relay 8 02, winding of relay 883, conductor 620 and thence to'hattery through the left winding of relay 613, shown and described in the aforementioned Patent 1,619,250. The register relay 613 in the sender and the register relay 103 in the testing circuit and relay 510 are operated in he circuit traced. The register relay 108 ioclred inposit-ion from ground through its contact 2 and upper winding to battery at Contact 3 of relay 114. The operation of rolay 5 establishes a circuit through contact 1 of relay 107 for operating relay 51 cuit is thus established through the wind: of relay 518 to ground at contact 4 of rel 114. This circuit is, however, not effective until the'ground shuntfroin the contact of rela 10 is removed. This ground shunt is r 1 Q "a removed by tne release of relay 0 10 upon the release of relays 621 and R The circuit for relay R is opened at contact 1. of relay 621. Relay 518' is now permitted to, operate in series with relay T 1e operation cl relay 518 disassociates ground from the win ding of relay 107 to cause itsrelease and associates ground withthe winding of relay 100 to cause the operation of the latter relay.

By referring to Patent 1,619,250 it will noted that a similar transfer from one register to another also takes place in the sender responsive to the setting of each register. The first transferis niadebyreleasin relay 600 and operating relay T00. V

The operation of'relay 100 and the ad Vance of switch 600 prepares the testing circuit for setting the relays of register B, Fig.-

1. The arrangement of relays 621, 622 and 623 is such that'their operation and release continues until the register relays of the sender and testing circuit are set for 4 digits or for any number of di its, depending upon the arrangement of the testing circuit. Each operation and release of the aforesaid relays causes the operation or" certain register relays in the testing circuit and sender. Therefore, the second operation of relay 621 connects ground from contact 2 of relay 512,,

through contact 2 of relay 513, contact 1 of relay 621, brush 603 audits associated contact'in position 2', brusl 1 .6-= and: itsassociatedv contact in position 4-, winding 'ofi relay R to batteryl The operation of relay R connects ground to conductor 640and conductor 641. A circuit is established from this ground over conductor 640, through the winding of relay 510, contact4 of relay 100, lower-winding of relaylOl, brush 535, contact'ofl-relay 802,winding ofrelay 883, conductor 620 and thence to battery through: the winding of the sender register-relay 711; The ground connected to conductor 641 establishes a circuitwhich may be traced through contact 5 of relay 100, lowerwinding of relay 104, upper winding of relay 103 to battery through contact 1 of relay 114, which relays both operate in the'circuit traced; This ground connected to conductor 641'm ay also be traced through brush 536'and its associated contact, through the windings or the sender register relays 770 and 712 to battery connected to the let-t contact of relay 803. Relay 103 is locked from. ground through its contact 2' and lower winding to battery through contact 3 ofrela-y 114. Relay 104 is locked from ground throughcontact 2 and its upper winding to battery at contact 2 of relay 114. The operation of relay 510 as traced from the circuit established overconductor 640 connects ground through its contact and contact llot relay 100 through the winding of relay 515'to battery. A circuit is thus established through the contact of relay 515 for the operation ofrelay 519' which is eifective when the shunt ground through the contact of relay 510 is removed. Relay 623 is released as'preyiously described upon the operation of relay 622. This establishes the previously described circuit for energizing motor magnet 601. The release of relay 622 after the release of relay 621 permits the brushes 602 and 603 to advanceto the third 621, thus openingthe circuit for relay 510 which permitsthe operation of relay 519. The operation of relay 519 disestalolishes the energizing circuit of relay 100 and establishes an energizing circuit for relay 307 from ground at contact 5 of relay 114 through the'winding of relay 307' to battery. The operation of relay 307prepares circuit paths for the energization of the associated relays of register C. i Upon the subsequent operation-of relay 621 ground is connected through its contact 1, brush 603, and associated contact in position 3, brush 614, winding of relay R to battery. The operation of relay R v connects ground to conductor 641 and ground through resistance 634 to conductor 640. Theconductor 640 extends through the winding of relay 510 as before, contact 4 of relay 30?, lower winding of relay 308, brush 535 and associated contact, contact of relay 802,windof relay 771- battery." Sincetheresistance 634'isin series with .the circuit traced, and. since relays. 308' and 771. aremarginal, only relay 5l0 operates. .Conductor 641 extends.- through;contacttlof relay 307, upper windings of relays 311' and 310 to battery'throughl contact 1 ofrelay. 114. Conductors 641 also extendsthrough brush536 to the left windff fwindingtobattery at contact 30f relay 114;

ingsofrela-ys 703- and 772 tobattery at the left "contactlof relay 8 03; Relays. 310, 311',- 703 andi7 7 2, are operated inthe circuit traced.

Relay -311 -is locked from groundthrough its contact 2 and lower winding to battery, at contact 2 ofrelay'114'; Relay 3101s locked from. ground through its contact 2 and lower Relay 516-iis operated ina circuit frornground to the contact of relay- 510, contactl of relay .307 to battery through the winding. of relay 516. A'circuit is thus established for relay.

. 520 as described for relay 519. The opera- 0 tion of relay 622 and the release of relay 623 againestablishes a circuit to energize mag net 601 which circuit is opened upon the rer 602and 603 to terminal position 4. The c1rlease'ofrelay 62211301 advancing the brushes cuit for. relay R is opened by the release of relay 621 which opens thecircuit for relay 510 to cause its release. The release of relay 510"permits' the operation of relay 520. The operation ofrelay 520 dises'tablishes the energizing circuit otrelay 307 and establishes an ground through contacts 20f relays 512 and 513,.contact 1ofrelay 621,.brush 603 and its'associatedcontact, brush 613, and its as} sociated' contact, winding-of relay R to bat- 2 tery. The operation of relay R associates ground through resistance 634 with conductor 640and ground through resistance 636 with conductor 641. Conductor 640 extends through winding of relay 510 as before, con- I .tact 4015 relay 300, lower windingof relay 301,.bru'sh 535, contact of relay 802, winding of relay 883, conductor .620, left winding of relay 775130 battery through the contact ofrela-y 803..= Since resistance 634 isin series with the circuit traced, and since relays 301 and 775 aremarginal, only relay-510 oper- I ates; @Condjuctor 641' isextendedthrough contact 5 of relay 300, lowerwinding-ot relay 304, upper'winding ofrelay 303 to battery 7 through contact 1 of relay 114. Conductor 641 is also extended through brush 536 through'the left windings of relays 773 and 774 to battery at the contact'of relay 803.

Since resistance 636 is in series with the relays traced'in this circuit, the marginal relays 304 and 77 3 do notoperate. Relays 303 and 774, however, operate in the circuit traced. The operationof relay 510 establishes a circuit through contact 1 of relay 300 for the operation of relay 517. A circuitis thus established for relay'521 which is efi'ective upon the release ofrelay 510. Re-

lay 510 is released upon' the release of, "relay R which isreleased by the release of. relay 621. Theswitch 600 is advancedin the manner previously described by the operation and release of relays 623 ,ajnd622l Switch 600 upon advancing .to. position 5 immediately establishes a circuit for advancingthe brush assemblyto position 6; This circuit maybe traced from ground through the right outer contact of key 620,.brush 602 "and its assoe ciated contact, self-interrupting contact and winding of magnet 601 to battery. The switch 600 is arrestedin this position, since at this time. the'operating 'circuit'for relay I 623 is opened by the'operation of relay 513. It will be remembered thata circuit for the operation of relay 521 was established upon the release of relay 510. The operation of relay 521 establishes an obvious circuit for the operation of relay 513. The latter relay,

at contact 2 opens the operating circuit for relay 623 and at contact 1 opens the circuit .for the operation of the. register control re f lays R to R? The operation of relay5'13- 0 takes place before the'releaseoif relay 622 false operation of the which precludes any testing apparatus. 7

The following is a chart'showing the regeration of any regi'stercontrol relay. This circuit register relays and the'first set ofthe 'sender'register relays, but may be used for any of the other sets of register relays.

Control, Condu'c- Resist- Test circuit re gisrelay tor ance I 1 terirelay cult reglster v relay R 640 None. 510,108 613 R 640 None. 510, 108 7 613 R 640 None. 510, 10s 613 641 "None. 111, no 7624, s25

. R4 640 1 634 510 "None 641 None. 624, 625

634 510 None s41 635 110 625.

,R 'j 7641 636 110 625 v 1 .642 None; 511, 109, 112, 113 613, 646 R7 r42 None. 511, 109; 112,- 113- "613, 646

R8 anv None: 110; 111 '1 624,625. 1 s42 None.- 511, 109, 112, 113 613, 646 I r R. .641 None. 110, 111 e24, 625 1 '642 634 511, 109, 112, 113 646 Test of sender digit by the operation of relay-R a circuit is established in thesencler for-the operaister relays that are operated upon the opwinding tion of relay 825 which circuit operation is described on page 9 of Patent 1,619,250. The operation of relay 825 removes the shunt from around the interrupter contact 823, .permitting the circuit through relays .881 and 220 to be interrupted. t will be remembered that the R relay was the first register control relay operated, thus controlling the sender to tran mit two interruptions to the relay 220, causing it to release twice. Upon the first release of relay .220 a circuit is established from ground through normal contact 5 of relay 229, the normal contact of relay 220, contact 1 of relay 227, vertical ofi -normal contact 230, winding. of relay'224 and winding of vertical magnet 222 to battery. Relay 224 and the vertical magnet are energized in the circuit traced, causing brushes 240 and 241 to be advanced to the first level of terminals .in terminal bank 200.

-. battery through the winding of vertical net 222, winding and contact of relay 224, vertical oil-normal contact 23 1, contact 1 of relay 227 to ground at the 5th normal contact of relay 229. Relay 224 is slow to release and therefore will remain operated during the time that the armature of relay 220 is attracted by the energization of relay 220 during the closed period of interrupter contact 823. Upon the second releaseof relay 220 a clrcuit is again established to energize the vertical magnet 222'from groundthrough the 5th normal contact of relay 229, normal contact of relay 220, contact 1 of relay 227, vertical ch -normal contact 231, contact and of relay 224 to battery through the u ling of the vertical magnet 222. The switch brushes 240 and 241 are thus advanced to the second terminal level. A shunt is established around interrupter contact and a transfer to the second set of registers is effected in the sender. When the second set of registers isassoc1ated wlth the pulsing circuit the shunt is again removed from the interruptercontacts 823 permitting the operation and release of relay 220 1n acl nce with the setting of the second sender Relay 220 is maintained in an operated position during this transfer and the holding circuit for relay 224 is maintained opened, thus causing the release of the latter relay. 7 i

Since relay R was operated for the second digit three interruptions will be permitted in the sender which will cause relay 220 to release three times. Upon the first release of relay 220, a circuit is established from ground through the normal contact 5 of relay 229, normal contact of relay 220, contact 1 relay 227, vertical off-normal contact 231, winding of relay 225 and winding of rotary magnet 223 to battery. The brushes 240 and 241 arerthus rotated to the firsttermi-nals of the second level. Upon the first rotary step of the brushes contact 22-l is' closed to prepare a circuit for the operation of relay This circuit is however f held openat the contact of relay 225, sincethis relay is slow to release and does not release between interruptions. Thecircuit arrangement for causing the second and third rotary steps for brushes 240 and 241 is the same as first and need not be described. Following the third interruption a transfer to the subsequent register relays takes place in the sender, =permitting the release of relay 225 for establishing the operating circuit of're'la y 229. This operatino circuit may be traced from battery through the winding of relay 229, rotary oif-norma'l contact 221, normal contact of relay 225' to ground through contact 2 of relay 227. The opera- 'tion of relay 229 extends the pulsing circuit from the sender. to switch 450. This switch isthesame as switch "250 and is therefore only shown diagrammatically. Relays, the

same as relays 220 and 227, are immediately operated'in switch 450- The relay iii-switchboard 450, which is the same as 22?, connects ground to the winding of relay 229, previous to the release of relay 227 in switch 250. Thus, relay 229 is maintained in an operated position. p .1

Brushes 401 and 402 are driven in a vertical and a horizgntal plane in responseto the impulses-transmitted from the sender for the third and fourth digits. Since relay R was operated for controlling the third 'digit' and relay R operated for controlling the fourth digit, the brushes 401 and 402 will be elevated to the fourth horizontal level and rotated to the fifth setof terminals'in' this level. It is thought unnecessary to-describe the detailed operation of switch 450 for positioning brushes 401 and 402. Z

The terminals of banks 200 and 400 are strapped to form horizontal and vertical ordinates which arrangement-permits a comparison of thennpulses transmitted by, the

sender for positioning theswi'tch with the setting of registers A, B, C and D. it will be rememberedthat these registers are set by the register control relays at the same time that the sender registers are set.' Therefore, in response to the operation oflregister control relays R R R and Ri'brush 240 should be connected with the second horiingly he lighted to indicate that th isregis ter was set for digit 2. The circuit for this 4 lamp may be traced trom battery through the lamp filament,normal contact 3 of 'relay 113, contact lof relay 108 to ground through normal contact 1, of relay 110. This ground ,is'also extended to the second horizontal terminal ordinate in terminal bank-200.

- Since brush 240 is resting upon a terminal in this ordinate, the ground is extended'over brush 240, contact 1 of relay 229 to batterythrough relay 211. The operationot relay 211 establishes an obvious circuit forlamp 213. The illumination of lamp 2 group A i "the secondlevel as directed by the sender response tothe setting of the register relays. 2o

' indicates that theregister relay Operatedcorresponds to the register control relay operated. .Lamp 213 is lighted to indicate that the switch brushes 240 and 241. advanceto in the" sender. It. is apparent that if" the brushes were advanced. to another level the ground extendedfrom the register A, would not operate relay 211 since this ground would not be connected to the switch brushv In register B, Fig. 1, it will be recalled that relays 101, 103, and 104 were operated in response tov the operation of register control relay R .""Lamp3 of lamp group 13 should accordingly be lighted. The circuit for this lamp may be tracedtfrom..battery through its filament, normal contact l'of relay 105, contact3 of relay 1'04, contact '3 of relay 101, normal contact 3 10f relay'102 to ground 1 to contact '1 ofrelay 103. This ground is also extended to the third vertical terminal ordinate in bank .200. If the 1 brushes 240 and 24lfwere directed by the sender in accordance with the operation" of the testing circuit control relay, B brush 241 shouldbe in contact with a terminal of the third vertical ordinate. .The ground from register B, Fig.2, is thus extended over brush'241, contact 2 of -relay 229 to battery through the winding ofrelay 210. The operation ofrelay 210 establishes an obvious circuitior illuminating lamp 212.

Register relays 310and 311 were seem the register group G: in response to the operation of register control relay R Lamp 4 in the O'group willtherefore be lighted.

The circuit for this lamp may be traced from battery through the lamp filament, normal'contact12 of relay 213, contact 1 of relay 311, normal contact 3 of relay 308, normal "contact 3 of relay 309 to groundthrough contact 1 of relay 310. This ground is also ex tended to the horizontal ordinate .in the fourth level of terminals in bank 400. If brushes 401 and 402 have been'properly positionedby thesender, ground is extended over brush 401 to battery through the winding of lamp 411. The operation oflamp 411 establishes an obvious circuit for lamp 413.

'In the register group D relay 303 isoperated in response to the operation of register control relay R 'The operation of relay 303 causes, lamp5 in the D group to be il luminated. The circuit for this lamp may be traced from battery through its filament, normal contact 1 of relay 306, normal contact 1 of relay 304, normal contact'3 of relay 301,

normal contact 3 of relay 3-02 to ground through contact 1 of relay 303. This ground is extended tothe fifth vertical terminal ordinatefof bank 400. If the brushes have been properly positioned by the sender, this ground gwilll'be extended to brush 402 to battery to. the winding of relay 410. The operation "ofrelay 410establishes an obvious circuit for lamp 412. I Since the. circuit disclosed herein is auto-.

matically operable, it is apparent thatfsignals 1 must be provided to indicate to an attendant or' ifthe sender is in trouble from other 9 causes, the switch brushes 240, 241, 401 and 402 Willn'ot be positioned properly upon the terminals of banks 200 fand 400. When this occursground'is not extended to therelays 210,211,410 or 411 depending uponfthe sender trouble. In the absence of a signal from lamps 212,213, 412 or 4131an attendant may inspecttheposition of the switch brushes with ing the signalslighted in lamp groups .A,

and4'11'l1ave' been operated by the circuits extended through. contact banks 200 and 400 as previously described. A circuit is thus established for, the operation of relay 512 which may be traced from battery, through its winding-contact 2 of relays 210, 211,410 and1411 to ground." The operation of relay 512 lights lamp; 522 which signal remains respect to the terminal ordinates and by not- 7 B, C and D analyze the trouble in the sender. Let it'be assumed that relays 210, 211, 410

lighted until the testing circuit apparatus has been restored to normal. 'A locking circuit isj established'for relay 512 through its windingand contact 1' to ground through offnormal contact 233 and the olt-normal con- .tactof switch 450.

It is ordinarily desirable to advance this testing circuit automatically from one test 'to another, Key 651 may be operated at the J same time as key 620 to cause this automatic advance. A. circuit is thus established upon the completion of a test to operate relay 050 from battery through its Winding, contact of key 651 to groundjat contact 2 of relay 512. Since relay 6 50 onlyoperates when the tion of magnet 611.

pulses from the sender have setall of the switch brushes in accordance with the operation of the register control relays, it is not necessary forv an attendant to observe the signals lighted. In the event or" a fault in i is to restore the testing circuit apparatus in- :cluding the switches 250 and 450 and to advance the switch 610 to a new position. The

circuit for relay 114 is opened which restores this relay and all of the register relays in groups A, B, C and D and the auxiliary control relays shown in Fig. '5 that were locked in position through the contacts of relay 114. The pulsing circuit established through the contact of lieyf620 and relay 650 is also'opened which causes the release of the switch controlling relays and permits the en- 'ergization of the release-magnets. The release magnet circuit for switches 250 and 450 are thesame and therefore only one 'i-lll l be traced. This release magnet is energized from battery through its winding, .vertical' off-normal contact 232, normal contact 1 of relay 227, normal contact of relay 220 to ground through normal contact 5 of relay 229. When both switches 250 and'450 are restored to normalthevertical ofi-normal contacts are opened which opens the locking circuit for relay 512 at the vertical oif-normal Contact 233 and a similar contact-in switch 450. At this time the lamp 522-is extinguished to indicate that the circuit has been advancedto a new test; Relay650 is released at this time to establish circuits for this new test which is similar to the'foregoing test described.

Two arrangements for advancing switch 610 have beenshown. When the circuit is ad- 'vanced automatically from one test to another, the operation of relay 650 establishes a circuit through its'contact 3 for the energiza- 650 opens the circuittraced permitting the advance of brushes 612 to 616 to the next terminal position. a

1V hen key 651 is not operated for the automatic advance of the testing circuit it-is necessary to restore key 620 to normal when the signals have been observed by an attendant. This restores the testing circuit apparatus to normal as previously described but does not advance switch 610 to a new testing position. Key 617 may be operated and released for the advance of this switch. The operation of key 617 connects ground through its right contact to the winding of magnet '611 and the release of key 617 permits the advance of the brushes 612 to 616. A difierent set of register control relays'is associated The release of relay with the sender registers and testing circuit registers in each position of switch 610. The control of the registers by the operation of any of the register control relays is in accordance with the chart presented herein. it will be not-ed that the contacts of switch 610 are connected with the control relays in such manner that practically any combinatioirof circuit arrangements for the operation of Variou's register relays may be established. The. '75 switch 530 may be advanced from position to position by the operation and release ofkey 526. Thus allot the senders in a telephone office may be associated with the testing 'circuit.- V fso 7 In the foregoing description'ot the testing circuit for setting the register relays in groups A, B, C and D the digits 2, 3, '4 and '5 were used. Only part of the register "relay operation was thus described since it was not- & necessary to operate relays 109, 112 and 118 or similar relays for these numbers. Inorder f to-co'mplete the description of the register relay operation it will be assumed that the testing, circuit is set for operatingregisterA fOICSBO the-digit T. For the purpose of this 'descrip tio'n, a circuit may be assumed from ground through the normal contacts 2 of relays 2512' and 513, contact 1 of relay 621,'sw itchesf600 ai1d610,'winding of relay R tobattery. 'zllheeees operation of relay R connects ground over conductor 642 through thewinding of relay 511, Contact 2 of relay 107, lower 'winding ot' relay 109,.brush 534 and its associatedcontact, sender relay 884, windingofrelay 613m1o0 to battery, Relay 884 operatesin this circuit in order to operate relay 646 which sets Zboth therelays'613 and 646 in the sender register,

and operates relay l09 iii-the testcircuitregisterA". The operation 01" relay 511 co'nnectsm ground from its contact 1 through contact 3 of relay 1'07, winding otrelay 112 to battery through contact 2 of relay 11.4; Relay 112 operates in'this circuit and establishes an obvious operating circuit for relay operation of relay 511 furtherestablishes an energizing circuit for relay 514 from ground through its contact 2, contact 10f relay 107,

winding of relay 514- to battery.

The operation of relays lOfl and 113 in reg-T322115 f p ister A establishesa'circuit for lamp '7 in lamp group A, which may be traced from battery through the lamp filament, contact 3' of relay 113, contact 1. of relay 109 to ground through normal contact 1 of relay l10.' .'The" i j relays 112 and 113 and similar relays in regist'er groups B, C and D are operated merely to establish paths to the lamps 6,7, 8, 9 and 0, and correspondin termin als in the terminal banks whenever the sender is set for any of the digits from 6 to10. In the case just described, the sender was set for digit 7 and therefore a circuit is extended from ground through contacts of the test circuit register relays to lamp 7 and to the terminals in the- 113. Theil vilo f lVhat is claimed is:

1,1 tions of said brushes.

Iseventh level'of 'terminalbank 200. The relays in groups B,"C andD are set in the same 7 manner as that described ingroup A.

'Ina signaling system, a. switch having brushes. each movable in a.p'lurality of dif ferent directionsand terminals arranged in 1 primary and secondary ordinates, signaling f-apparatus for said primary and secondary ordinates, means for directing said brushes to particular terminals, and means responsive to the positioning. ofsaid, brushes to operate said signaling apparatus in accordance with *ordinate loca the p mary and secondary 1 1 v In. a signaling system, a switch having brushes each movable in plurality of different directions and terminals arranged in [siv'e to'jthe positioning. of said jbrushe's to i operateiisaid signaling apparatus in accord f 5 ance'with :the' primary and secondary sordihate locations of 'saidfbrushes to indicate the v positiontakenby said brushes, v

V f 3; .In-asignaling system, a sw tch having 7 brushes-each movable in a plurality' 'of dif n ferentdirections-and terminals strapped to-' v, getherinrprimary and secondary ordinates,

' m eansfor di-recting said brushes to particular terminals,- signaling *apparatus, a and .means responsive'to the positioning of said brushes tofloperate said signalingapparatus secin caccordancewith the primary and ondary ordinate locations of said brushes. In a signaling system, a switchhaving a'f brush set capable of motion in fa p] l1 I" LlIty: 4 of difierent directions, and terminals arrangedin primary and'secondary ordinates,

slgnaling apparatus for said primary and secondary ordinates, means for directing said i b h' t to particular terminals, nd'

4a responsiveto the position of said" brush set "to'operate signaling apparatus in accordance with the primary terminalfordinate' as as- ;sociated with one brush of saidset and the secondary terminal ordinate as associate I *Withanotheribrush ofsaidset.

Ina systemhr testlng an. mpulsep' ro-i ducing" device, means-for variably controliniprimary and'secondary ordinates, means -;responsive to impulsesprodu'ced for-associ- Cating saidbrusheswith any combination of said ordinates, signals for indicating the ordi- "1360' nates associated with said brushes and means 7 responsive to the association of said brushes 'with'terminals of said ordinates for operatring. said signals. i

- 6. In a system 7 for testing an impulse proj=ducingdevice, means for variably controlvling said device toproduce series ofimpulses,

a plurality of switches, each having a pair of brushes movable in the same directions and a pluralityfof stationary terminals ar- .ranged inprnnary and secondary ordlnates,

means responsive to i mpulses produced for assoclatmg each brush of said palr with a forindicating the ordinate associated with each brush, and means for operatlng sa d s gnals lnresponse to: sald association.

. difierent ordinate, signals for each switch 7. In a system for testing an impulse "pm I 'ducing device, means for yariably controlling is a 7 said device to produce series ofimpulses,

a switch having movable brushes and a' plurality of; stationary terminals arranged in primaryand secondary ordinates, ,means:op-'

erable in'response to the operation of said controlling meansfor electrically characterizing certain primary and seconda'ryordinates,

:means responsive to impulses vproduced for associating, said brushes with s'ai d ch aracter [lzed ord1nates,s1gnals,for ndicating the association of said brushes with said character-. c iz'ed' ordinates, and means for operat1ng sa d;

signals. j

8. In a system for testing aniinpulse producing device, means operable for variably v controlling s a-id device to produce series of impulses, a switch having movable brushes and a plurality ofstationary terminals are franged in'primary; and secondary ordinates, 'means responsive to impulses produced for associating saidbrushes with combinations of s a-1d ordlnates, srgnalsfor ndicating the nals for indicating the position taken by said setting of said device, means responsive to the V brushes in response tosaid impulses, and" means-to operatesaid othersignals; A 9. In a signaling system,a switch having two movable brushes and stationary termiv nals arranged in levels, each level having two rows of termlnals. forengagementw1th sald brushes, the terminals of 'saidqrowsbeing strapped together to form a plurality ofhoriz ontal and vertical ordinates, means to electrically characterize a horizontal and] a ver I ,ticalor-dinate, means to transmitimpuIses for] E V directing said'br'ushes to said-characterized ling said grdevlce' to produce a series ofim- 3 pulses, .a switch having movable brushes and. .2.155 a plurality of stationary terminals arranged ordinates, signals: for each of said ordinates,

10. In a signaling system, an impulse'produc'ing device', means for producingimpulsesfor a series ofdigits, a'switch having movnals, said terminals being arranged in pri- 7 mary and secondary ordinates, means to velectrically characterize a certain primary and a a ,7 able brushes and a bank off-stationary termito impulses produced for a plurality of digits for associating said brushes with said characterized ordinates, and signaling means for indicating when said brushes register with said characterized ordinates.

11. In a signaling system, a switch having movable brushes and stationary terminals, said terminals being arranged in a plurality of levels, each level having a pluralityolt rows of terminals for engaging said brushes, said terminals being strapped together in a. manner to form horizontal and vertical ordinates, means to transmit impulses to step all of said brushes in horizontal and vertical directions, signaling means for each directional group of ordinates, and means to operate said signals in response to the arrival of said brushes upon certain terminals of said ordinates.

12. In a system for testing a switch positioning device, means automatically operable for variably controlling said switch positioning device for producing impulses for a. series of digits to position switches in aparticular manner, a switch having movable brushes and a bank of stationary terminals, said terminals being connected in horizontal and vertical ordinates, means to characterize a certain horizontal and a certain vertical ordinate by connection of electrical circuits thereto in response to said control means, means responsive to the impulses produced for two digits to position said brushes and signaling means energized by the association of said brushes with said characterized ordinates to indicate that the impulses for each digit are produced by said device in accordance with the operation of said control means.

18. In a system for testing senders, a plurality of switches having movable brushes and stationary terminals, said terminals being arranged in primary and secondary ordinates, a plurality of registers, a plurality of control relays automatically operable for setting a sender for producing impulses for a series of digits to position said brushes on particular terminal ordinates and for setting said plurality of registers, signals operated in response to said register settings for indicating the terminal ordinates to which said brushes have been directed and signals to indicate the particular terminal ordinates on which said brushes have been positioned by the impulses produced by said sender.

14:. In a telephone system, a plural ty of registers for controlling the transmisslon of i l a group of electro-magnetic devlces for establishing circuits for operating said registers, each device otsaid group being operable to set a register in a particular manher. and an automatically operable sw1tch1ng mechanism for variably operating the devices of said group for variably setting said plurality of registers.

' 15; "n1 anthem S stems" plurality of registers for controlling the transmission of impulses, a plurality of electromagnetic devices for establishing c'ircuits'ior operating said registers, each device 01 l sai'dlgr'oup being operable to set are'gister for the transmission of impulses for a particular digit,

variably adjustable switching apparatus for I controlling the devices of said group, a switch for consecutively establishing operating circuits for said devices in accordance with the adjustment or" said switching apparatus, and means for progressively operating said switch in response to the setting of each register.

17. In a telephone system, switches, a plu rality of registers for controlling the transmission of impulses for positioning said switches, a group of electromagnetic devices for establishing circuits for operating said registers, each device of said group being operable to set a register in a particular manner, an automatically operable switching mechanism for variably operating the devices of said group for variably setting said plurality of registers, and means to variably position said switches in accordance with the setting of said registers.

18. In a telephone system, switches, a plurality of registers for controlling the transmission of impulses for positioning said switches, a group of electromagnetic devices for establishing circuits for operating said registers, each device of said group being operable to set a register in a particular manner, an automatically operable switching mechanism for variably operating the devices of said group for variably setting said plurality of registers, means to variably position said switches in accordance with the setting of said registers, signals and means to operate said signals for indicating the position taken by said switches.

19. In a telephone system, a plurality of relay registers for controlling the transmis sion of impulses comprising marginal and non-marginalrelays, resistances, group of relays for establis ing circuits including or excluding said resistances for variably operating the relays of said registers, each relay of said group being operable to operate certain relays of a register, an automatically op- 1 O imsm loj ei'a-ble switching means fpriva ri ablyb perat-i ing the; relays f said group-for variablypp-,

I eratingthe' re1ay of said-registers, and-signa'ls forind icating the im u ls s transmitted. W

In witness whereof l ereuntqsubscribe my name Vthis29th day of 11111631928.

- i BERT; G." DUNHAM '7 

